00:00:01 How to study Three Dimensional Geometry

00:05:00 Direction Ratios and Direction Cosines

00:12:43 Question 1

00:15:43 Question 2

00:18:33 Question 3

00:22:43 Question 4

00:29:53 Question 6

00:40:23 Angle between two lines using Direction Ratios

00:51:43 Question 8

00:55:13 Question 9

00:58:23 Question 5

01:01:13 Question 10

01:04:53 Question 11

01:11:03 Angle between two lines using Direction Cosines

01:18:33 Question 7

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